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At UM Health-West Gastroenterology, our team offers a wide range of services to diagnose, treat and prevent future digestive diseases. Our physicians use the latest endoscopic equipment to thoroughly assess a patient’s symptoms and prescribe an effective treatment. They visit patients in the hospital who may be experiencing digestive conditions and provide screening services on an outpatient basis.


  • Outpatient & Inpatient Consultations
  • Endoscopy
  • EGD
  • Colonoscopy
  • Flexible Sigmoidoscopy
  • Endoscopic Retrograde Cholangiopancreatography (ERCP)
  • Small bowel Enteroscopy
  • Video Capsule Endoscopy
  • Bravo PH study
  • High Resolution Manometry and Impedance Study
  • Hemorrhoidal Infrared Coagulation
  • Liver Biopsy
  • Endoscopic Ultrasound (EUS)
  • Management of Large/Complex Polyps
  • Zenker’s Treatment
  • Bariatric Endoscopy
  • Interventional Endoscopy
  • POEM Evaluation
  • Management of Bowel Stricture
  • Enteral Stenting
  • 24 Hour Impedance Study
  • Surgical treatment of colon and rectal cancer 
  • Diverticulitis 
  • Crohn’s disease
  • Ulcerative colitis
  • Hemorrhoids 
  • Anal abscess & fistula 
  • Pilonidal disease 
  • Anal fissure 
  • Fecal incontinence 
  • Parastomal hernia 
  • Stomal prolapse 
  • Rectal prolapse 


Phone: 616.252.5775   
Fax: 616.252.6702


Luke DeRoo, DO
Armita Ghoddousi, DO
Ryan Hamby, DO

Colorectal Surgery

Antonia Henry, MD


Ammar Hassan, MD

Inflammatory Bowel Disease

Michelle Muza-Moons, MD

Advanced Endoscopy

Thomas Riley, MD


2093 Health Drive SW, Suite 302
Wyoming, MI 49519

Allendale Health Center
4830 Becker Drive
Allendale, MI 49401

2093 Health Drive SW, Suite 100
Wyoming, MI 49519